class Settings:
    """存储游戏设置的类"""
    def __init__(self):
        self.screen_width=1200
        self.screen_height=800
        self.bg_color=(230,230,230)
        self.ship_speed=5
        self.bullet_speed=15.0
        self.bullet_width=3
        self.bullet_height=15
        self.bullet_color=(60,60,60)
        self.bullets_allowd=4